package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.*;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishDiAbleFailedBySetmealEnAbleException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Transactional //事务注解保证方法的原子性
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);

        //获取上一条插入数据之后生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //在添加口味的时候需要知道当前菜品的id
            flavors.forEach(dishFlavor -> {dishFlavor.setDishId(dishId);});
            dishFlavorMapper.insertBatch(flavors);
        }
        //向口味表插入多条数据
    }

    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page =  dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());

    }

    @Transactional
    //批量删除菜品
    public void delectBatch(List<Long> ids) {
        //判断当前菜品是否可以删除---是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中   这里的错误是抛到哪里的
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否可以删除---是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //根据ids批量删除菜品表中的菜品数据
        //sql: delete from dish where id in (ids)
        dishMapper.deleteByIds(ids);

        //根据ids批量删关联的口味数据
        //sql: delete from dish_flavor where dish_id in (ids)
        dishFlavorMapper.deleteByDishIds(ids);


    }

    //根据id查询菜品和对应的口味
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //组装数据
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品表基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //在添加口味的时候需要知道当前菜品的id
            flavors.forEach(dishFlavor -> {dishFlavor.setDishId(dishDTO.getId());});
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 菜品的起售和停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        if (status == StatusConstant.ENABLE) {
            Dish dish = Dish.builder()
                    .status(status)
                    .id(id)
                    .build();
            dishMapper.update(dish);
        }else {
            List<SetmealDish> setmealDishes = setmealDishMapper.selectByDisId(id);
            setmealDishes.forEach(setmealDish -> {
                Long setmealId = setmealDish.getSetmealId();
                Setmeal setmeal = setmealMapper.selectById(setmealId);
                if (setmeal.getStatus() == StatusConstant.ENABLE){
                    throw new DishDiAbleFailedBySetmealEnAbleException(MessageConstant.DISH_DIABLE_FAILED_BY_SETMEAL_ENABLE);
                }else {
                    Dish dish = Dish.builder()
                            .status(status)
                            .id(id)
                            .build();
                    dishMapper.update(dish);
                }
            });
        }
    }
}
